The Outdoor Reset Circulator controls the hot water supply temperature, so that the heat supplied to the building equals the heat loss of the building. The 00-VR modulates the circulator to inject hot water from the boiler loop into the radiant or reduced temperature loop while providing Outdoor Reset to a heating system. Available in any style 003 – 0014, the 00-VR also comes with a boiler sensor to protect against low return temperatures. The 00-VR is the ultimate for protection, control, ease of installation, and trouble-free operation.